*Since April 2005, all new gas-fired boilers fitted in England and Wales must be condensing (oil-fired boilers must also be condensing from 2007). In certain cases, exemptions to this regulation are permitted where the fitting of a condensing boiler may be impractical.

Cost-benefit guidelines**

The figures in this table are only an indication of cost – actual quotations could be higher or lower.

Notes

• the costs and savings figures will vary according to the size of the house, its location, the measure (if appropriate), fuel, heating system and the materials used
• energy savings are estimated from a range of standard house types with gas heating and a standard occupancy. Actual savings depend on individual circumstances. Remember that some of the benefit may be taken in improved comfort
• DIY costs are for those measures where an average level of DIY skill is required. If in doubt about any aspect of the installation skills required consult an appropriately qualified person

The installed costs per measure for insulation measures is intended to be representative of the typical cost to the house-holder in a subsidised scheme e.g. Energy Efficiency Commitment (EEC), calculated as an average across schemes as at May 2006.

External wall insulation costs are marginal costs, assuming remedial work is being undertaken on the walls at the time of installation.

Heating control costs assume the additional costs for installation when an installer is at the premises working on the heating system.

Lighting savings assume a mixture of wattages replaced and hours of use.

DIY Cost of Floor insulation assumes the material cost of the insulation required only.

Savings given for condensing boilers assume that the installation of condensing boilers is mandatory and hence no additional cost against a minimum standard building regulations compliant boiler.

** NB Always consult an appropriately qualified person before undertaking any project. Make sure you have the correct level of skill before undertaking any DIY.